Chapter 1. Planning Studies: Sample Size for Confidence Intervals

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Question 1

0:36

Question 1.1

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Correct. Margin of error is z*\(\frac{\sigma}{\sqrt{n}} \).
Incorrect. Margin of error is z*\(\frac{\sigma}{\sqrt{n}} \).
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Question 2

1:15

Question 1.2

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Incorrect. Yes, we can set confidence and desired margin of error and determine the required sample size to achieve those.
Correct. Yes, we can set confidence and desired margin of error and determine the required sample size to achieve those.
Incorrect. Try again.
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Question 3

2:33

Question 1.3

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Incorrect. In order to determine required sample size, a researcher has to specify the margin of error they desire.
Correct. In order to determine required sample size, a researcher has to specify the margin of error they desire.
Incorrect. Try again.
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Question 4

3:34

Question 1.4

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Correct. “How many measurements must we take . . .?” asks us to find sample size.
Incorrect. “How many measurements must we take . . .?” asks us to find sample size.
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Question 5

4:33

Question 1.5

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Incorrect. Since we cannot sample part of an individual, we must sample the entire individual. So, we always round up to the next whole number.
Correct. Since we cannot sample part of an individual, we must sample the entire individual. So, we always round up to the next whole number.
Incorrect. Try again.
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Applet

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